Overview
The MC34166TVG is a high-performance, monolithic power switching regulator produced by onsemi. This device is part of the MC34166 and MC33166 series, which are optimized for dc-to-dc converter applications. It operates as a fixed frequency, voltage mode regulator and contains all the active functions necessary to implement step-down and voltage-inverting converters with a minimal number of external components. The MC34166TVG can also be used cost-effectively in step-up converter applications.
The device features an internal temperature-compensated reference, a fixed frequency oscillator with on-chip timing components, a latching pulse width modulator, a high gain error amplifier, and a high current output switch. It includes protective features such as cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown, along with a low power standby mode.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Input Voltage | VCC | 40 | V | ||
| Switch Output Voltage Range | VO(switch) | −1.5 | + Vin | V | |
| Voltage Feedback and Compensation Input Voltage Range | VFB, VComp | −1.0 | + 7.0 | V | |
| Operating Junction Temperature | TJ | +150 | °C | ||
| Operating Ambient Temperature | TA | 0 | +70 | °C | |
| Oscillator Frequency | fOSC | 65 | 72 | 79 | kHz |
| Output Switch Current | Ipk(switch) | 3.3 | 4.3 | 6.0 | A |
| Thermal Resistance, Junction-to-Ambient | θJA | 65 | °C/W | ||
| Thermal Resistance, Junction-to-Case | θJC | 5.0 | °C/W |
Key Features
- Output Switch Current in Excess of 3.0 A
- Fixed Frequency Oscillator (72 kHz) with On-Chip Timing
- Provides 5.05 V Output without External Resistor Divider
- Precision 2% Reference
- 0% to 95% Output Duty Cycle
- Cycle-by-Cycle Current Limiting
- Undervoltage Lockout and Thermal Shutdown
- Low Power Standby Mode (reduces power supply current to 36 μA)
Applications
The MC34166TVG is suitable for various applications, including:
- Automotive systems
- Computer and industrial power supplies
- Cost-sensitive consumer products
- Step-down and voltage-inverting converters
- Step-up converter applications
Q & A
- What is the maximum power supply input voltage for the MC34166TVG?
The maximum power supply input voltage is 40 V.
- What is the typical oscillator frequency of the MC34166TVG?
The typical oscillator frequency is 72 kHz.
- What are the protective features included in the MC34166TVG?
The protective features include cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- What is the operating ambient temperature range for the MC34166TVG?
The operating ambient temperature range is 0°C to +70°C.
- What is the maximum output switch current of the MC34166TVG?
The maximum output switch current is in excess of 3.0 A.
- What is the purpose of the undervoltage lockout feature?
The undervoltage lockout feature ensures that the integrated circuit is fully functional before the output stage is enabled, preventing erratic output switching.
- How does the thermal shutdown feature work?
The thermal shutdown feature disables the output switch when the maximum junction temperature is exceeded, typically at 170°C, to prevent catastrophic failures from accidental device overheating.
- What is the power supply current in standby mode?
The power supply current in standby mode is reduced to 36 μA.
- What type of package is the MC34166TVG available in?
The MC34166TVG is available in a TO-220 vertical mount package.
- What are some common applications for the MC34166TVG?
Common applications include automotive systems, computer and industrial power supplies, and cost-sensitive consumer products.
